CN1612488A - Radio frequency receiving channel automatic gain control method - Google Patents
Radio frequency receiving channel automatic gain control method Download PDFInfo
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- CN1612488A CN1612488A CN 200310103310 CN200310103310A CN1612488A CN 1612488 A CN1612488 A CN 1612488A CN 200310103310 CN200310103310 CN 200310103310 CN 200310103310 A CN200310103310 A CN 200310103310A CN 1612488 A CN1612488 A CN 1612488A
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Abstract
The method sets up threshold values A and B in advance, and A is larger than B. the method also includes following steps: (a) determining whether output signal of radio frequency reception channel is larger than threshold value A; if yes, reducing X of output signal of radio frequency reception channel, X is larger than zero and smaller than difference between A and B; retuning back to (a), otherwise executing step (b); (b) determining whether input signal of radio frequency reception channel is larger than threshold value B; if yes, increasing X of output signal of radio frequency reception channel; otherwise, not adjusting power of output signal and returning back to step (a). Through reducing auto gain of radio frequency reception channel, the invention prevents issue of switching power of output signal up and down frequently when wobble of input signal power in radio frequency reception channel occurs. The method is simple and reliable.
Description
Technical field
The control technology that the present invention relates to gain is meant a kind of control method of radio frequency reception channel automatic gain especially.
Background technology
Referring to shown in Figure 1, the radio communication receiving system comprises antenna, radio frequency reception channel and data signal processing unit.In the radio communication receiving system, radio frequency reception channel is handled the electromagnetic signal of antenna induction, and the signal after the processing carries out digital processing again.Receiving dynamic requirements than under the condition with higher, radio frequency reception channel often adopts automatic gain control (AGC) technology, thereby can reduce the dynamic requirements of A/D converter.
Referring to shown in Figure 2, receiver AGC controlling models comprises receiving front-end 201, controllable gain device 202, radio frequency amplifying unit 203, A/D converting unit 204, digital signal processing unit 205 and received signal intensity computing module 206.Under initial condition, the gain of controllable gain device 202 is 1.After receiving front-end 201 receives the radiofrequency signal that antenna sends, with radiofrequency signal input radio frequency amplifying unit 203, radiofrequency signal inputs to A/D converter 204 after amplifying, and being converted to digital signal through A/D converter 204, this digital signal inputs to digital signal processing unit 205 again and handles; Simultaneously, two threshold value A and B are set in the control algolithm of received signal intensity computing module 206, and A＞B, received signal intensity computing module 206 utilizes the digital signal of digital signal processing unit 205 outputs, calculate the intensity of D point received signal, reduce the radio-frequency channel gain if D point signal during greater than threshold value A, is just regulated the controllable gain device, if during less than threshold value B, then regulating the controllable gain device, D point signal increases the radio-frequency channel gain.
The basic control scheme of controlling models shown in Figure 2 is referring to shown in Figure 3, and wherein, transverse axis is represented the input signal power of receiving front-end, and the longitudinal axis is represented the output signal power of radio frequency reception channel.When the input signal of receiving front-end reached the thermal noise level of receiver, the output signal power of radio frequency reception channel was the D value.
Its basic control principle is: two threshold value A and B are set in the control algolithm of received signal intensity computing module 206, and A＞B, received signal intensity computing module 206 constantly detects the output signal power of radio frequency reception channel.At (P1, P2) in the interval, continuous increase when the input signal power of receiving front-end, the output signal power of radio frequency reception channel is also in continuous increase, when the input signal power of receiving front-end is increased to threshold value A, adjust output signal power, output signal power is reduced A-B, output signal power arrives threshold value B; When the input signal power of receiving front-end during less than the threshold value B value, adjust output signal power, the output signal power of radio frequency reception channel is increased A-B, output signal power arrives threshold value A.When the input signal power of receiving front-end reaches the P2 shown in the figure, P3, P4 point, the gain of the passage of radio frequency will be done once to adjust.
According to above-mentioned analysis as can be known, when system did not have business, the input signal power of receiving front-end was constant, and the radio-frequency channel gain is constant.And, when input signal power reaches P3, P4 point, just need adjust the radio-frequency channel gain by module 202 along with the rising of traffic carrying capacity.
As known from the above,, when promptly fluctuating up and down, will cause the frequent switching that gains if accept input signal power wild effect when P2, P3, P4, P5 point of front end, bigger if stepping is switched in gain, will influence the receiving front-end received signal.
Summary of the invention
The control method that the purpose of this invention is to provide a kind of radio frequency reception channel automatic gain can be avoided causing the frequent variations that gains in the radio-frequency channel owing to the fluctuation of receiving front-end input signal power.
The control method of a kind of radio frequency reception channel automatic gain provided by the invention comprises:
A. whether judge the current output signal power of radio frequency reception channel greater than threshold value A, if greater than, then the output signal power of radio frequency reception channel is reduced X, and X returns step a greater than 0 and poor less than A and B, otherwise, execution in step b;
Whether the output signal power of b. judging described radio frequency reception channel less than threshold value B, if less than, then the output signal power with radio frequency reception channel increases X, returns step a, otherwise, do not handle, return step a.
Described X equals 1/2nd times of difference of A and B.
The adjustment amount that the present invention gains by the minimizing radio-frequency channel, thus when shake takes place the input signal power of radio frequency reception channel, avoid the frequent up and down switching problem of output signal power, and method is simply, reliably.
Description of drawings
Fig. 1 is a wireless receiving passage principle schematic;
Fig. 2 is a wireless receiving passage AGC principle schematic in the prior art;
Fig. 3 is the performance plot of AGC principle control radio frequency reception channel output in the prior art;
Fig. 4 is for realizing the schematic flow sheet of the inventive method;
The performance plot that Fig. 5 exports for the specific embodiment control radio frequency reception channel that realizes the inventive method.
Embodiment
For make purpose of the present invention, technical scheme, and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
Referring to shown in Figure 4, realize that method of the present invention may further comprise the steps:
Whether step 401, the continuous received signal of radio frequency reception channel, the output signal power of judging radio frequency reception channel greater than threshold value A, if greater than, execution in step 402, otherwise, execution in step 403;
Lift specific embodiment below and describe technical scheme of the present invention in detail in conjunction with Fig. 2 and Fig. 5.
Referring to shown in Figure 5, A, B are two power threshold that are provided with in received signal intensity computing module 206.P3, P5, P7 are that point is adjusted in the gain of signal when increasing gradually, and P2, P4, P6 are that point is adjusted in the gain of signal when reducing gradually.When the receiver thermal noise level was P1, the radio frequency reception channel output signal power was C.
The input signal power of receiving front-end is between P1～P3: under initial condition, along with the input signal power of receiving front-end constantly increases, the radio frequency reception channel output signal power also constantly increases, this moment receiving front-end input signal power and output signal power between be directly proportional.When radio frequency reception channel output signal power during greater than threshold value A, received signal intensity computing module 206 is adjusted the radio-frequency channels gain, and the radio-frequency channel gain is reduced X, makes the radio frequency reception channel output signal power be between threshold value B and the A, i.e. the c point.
After this, have two kinds of situations and occur: a kind of is the situation of the input signal power increase of receiving front-end, and a kind of is the situation of the input signal power minimizing of receiving front-end.
First kind of situation is: promptly the input signal power of receiving front-end is between P3～P1, when the input signal power of receiving front-end reduces, the radio frequency reception channel output signal power is also in continuous minimizing, when radio frequency reception channel output signal power during less than threshold value B, received signal intensity computing module 206 is adjusted the radio-frequency channel gain, the radio-frequency channel gain is increased X, it is the g point, then, along with the input signal power of receiving front-end constantly reduces, the radio frequency reception channel output signal power is also in continuous minimizing.
Second kind of situation is: promptly the input signal power of receiving front-end is between P3～P5, when the input signal power of receiving front-end increases, the radio frequency reception channel output signal power is also in continuous increase, when the radio frequency reception channel output signal power is increased to threshold value A once more, it is the d point, received signal intensity computing module 206 is adjusted the radio-frequency channel gain, and the radio-frequency channel gain is reduced X, i.e. h point.
By above-mentioned steps as can be seen, the present invention reduces the yield value adjustment amount, can avoid causing the frequent up and down switching problem of output signal power owing to accept the shake of front end input signal power.
Claims (2)
1, a kind of radio frequency reception channel auto gain control method is characterized in that, sets in advance threshold value A and B, and A is greater than B, and this method comprises:
A. whether judge the current output signal power of radio frequency reception channel greater than threshold value A, if greater than, then the output signal power of radio frequency reception channel is reduced X, and X returns step a greater than 0 and poor less than A and B, otherwise, execution in step b;
Whether the output signal power of b. judging described radio frequency reception channel less than threshold value B, if less than, then the output signal power with radio frequency reception channel increases X, returns step a, otherwise, do not handle, return step a.
2, method according to claim 1 is characterized in that, described X equals 1/2nd times of difference of A and B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310103310 CN1612488A (en) | 2003-10-28 | 2003-10-28 | Radio frequency receiving channel automatic gain control method |
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| CN 200310103310 CN1612488A (en) | 2003-10-28 | 2003-10-28 | Radio frequency receiving channel automatic gain control method |
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| CN1612488A true CN1612488A (en) | 2005-05-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101170329B (en) * | 2006-10-27 | 2012-06-06 | 中兴通讯股份有限公司 | A method for adjusting multi-cell downlink power control |
| CN105629205A (en) * | 2015-12-25 | 2016-06-01 | 西安电子工程研究所 | Radar receiving front-end self-adaptive protection switch control method and circuit |
| CN101087162B (en) * | 2006-06-09 | 2016-07-06 | 希捷科技有限公司 | Method and apparatus for the automatic growth control of channel status auxiliary |
| CN109451573A (en) * | 2018-12-25 | 2019-03-08 | 京信通信系统（中国）有限公司 | Gain distributes self-adjusting AGC control method, apparatus and system |
-
2003
- 2003-10-28 CN CN 200310103310 patent/CN1612488A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101087162B (en) * | 2006-06-09 | 2016-07-06 | 希捷科技有限公司 | Method and apparatus for the automatic growth control of channel status auxiliary |
| CN101170329B (en) * | 2006-10-27 | 2012-06-06 | 中兴通讯股份有限公司 | A method for adjusting multi-cell downlink power control |
| CN105629205A (en) * | 2015-12-25 | 2016-06-01 | 西安电子工程研究所 | Radar receiving front-end self-adaptive protection switch control method and circuit |
| CN109451573A (en) * | 2018-12-25 | 2019-03-08 | 京信通信系统（中国）有限公司 | Gain distributes self-adjusting AGC control method, apparatus and system |
| CN109451573B (en) * | 2018-12-25 | 2021-05-28 | 京信通信系统（中国）有限公司 | AGC control method, device and system with self-adjusting gain distribution |
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